Anyone who believes they can bathe instead of exercise is probably not exercising to begin with. I doubt this study would result in reduced exercise. But I could be wrong.
Even George Jetson would sit around while the computer exercised for him, so I guess we know what's coming in the future.
People who don't exercise simply die young (in their 50s and 60s) and people who are healthy can cling on for decades fully utilizing the range of expensive treatments.
I would agree that a billionaire with predictable medical expenses will more options than a person in any sort of health and likely live longer. Most people in bad health don't have unlimited money thought (simply because most people don't have unlimited money).